<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="vue.js"></script>
</head>
<body>
    <div id="app">
        <p v-once>{{msg}}</p>
        <p>{{msg}}</p>
        <input type="date" v-model="msg">
        <script>
            let vm = new Vue({
                el:"#app",
                data(){
                    return{
msg:"今天天气嘎嘎好"
                    }
                }
            })
        </script>

    </div>
</body>
</html>